Equilibrium mappings in polar-isotropic confined active particles

Regular Article

DOI: 10.1140/epje/i2017-11551-3

Cite this article as:
Fily, Y., Baskaran, A. & Hagan, M.F. Eur. Phys. J. E (2017) 40: 61. doi:10.1140/epje/i2017-11551-3


Despite their fundamentally nonequilibrium nature, the individual and collective behavior of active systems with polar propulsion and isotropic interactions (polar-isotropic active systems) are remarkably well captured by equilibrium mapping techniques. Here we examine two signatures of equilibrium systems --the existence of a local free energy function and the independence of the coarse-grained behavior on the details of the microscopic dynamics-- in polar-isotropic active particles confined by hard walls of arbitrary geometry at the one-particle level. We find that boundaries that possess concave regions make the density profile strongly dynamics-dependent and give it a nonlocal dependence on the geometry of the confining box. This in turn constrains the scope of equilibrium mapping techniques in polar-isotropic active systems.

Graphical abstract


Flowing matter: Nonlinear Physics 

Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Yaouen Fily
    • 1
  • Aparna Baskaran
    • 1
  • Michael F. Hagan
    • 1
  1. 1.Martin Fisher School of PhysicsBrandeis UniversityWalthamUSA

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